C2 Software Backend Engineer

About Us

Harmattan AI is a next-generation defense prime building autonomous and scalable defense systems. Following the close of a $200M Series B, valuing the company at $1.4 billion, we are expanding our teams and capabilities to deliver mission-critical systems to allied forces.

About the Role

We are looking for a dedicated Backend Software Engineer to join our C2 Core team in Paris to build the nervous system of our new tactical Command and Control (C2) application. You will enter a highly technical, mission-critical environment where low latency, fault tolerance, and secure data handling are paramount. You will be responsible for the core architecture that ensures real-time telemetry, heavy video streams, and mission commands flow seamlessly between our robot fleet and internal C2 components, such as the Common Operational Picture (COP) and Mission Planner.

Responsibilities

• Robot-to-C2 Communications Gateway: Design and implement ingestion pipelines for high-frequency telemetry and video streams from multiple robots simultaneously.

• Internal Messaging & IPC: Build the inter-process communication (IPC) or local pub/sub systems to route sensor data, user commands, and mission plans between the HMI and the robot fleet.

• Resource Optimisation: Ensure the backend runs efficiently on local tactical PCs, managing CPU and memory footprints to prevent interference with UI or planning algorithms.

• Fault Tolerance: Architect state machines capable of handling the chaos of tactical environments, including frequent network drops and packet loss, without corrupting the Common Operational Picture.

• Cross-Functional Collaboration: Partner with Mission Planning algorithm designers, HMI frontend developers, and UX designers to deliver a cohesive product.

Candidate Requirements

• Educational Background: B.S. or M.Sc. in Computer Science, Software Engineering, or a related field

• Technical Skills: Strong command of system-level languages such as C++, Rust, or Go. Deep expertise in Real-Time Networking (UDP, TCP, WebRTC, gRPC, DDS, or custom binary protocols). Expertise in Systems Architecture & IPC, specifically using bounded ring buffers or zero-copy shared memory for high-concurrency pipelines.